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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff524d7c34cc9162188fbc07367cf4684a764ad19719eb1ee5974f77a132dad4' 
  AND token = 'PhN6MPwT5REktPRA82203aNQuKQnj+2Z5Xgl7E/eNW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}